Compare The Telephone Network And The Internet. What Are The Similarities? What Are The Differences?

The telephone network consists of a connection orientated circuit switch network. A call signal has to be used in order to establish a connection, or circuit, between two points before an exchange of information is possible. Once the connection has been made, switches reserve the relevant bandwidth for the full period of the call. As a result, the network path a call takes is fixed and, as a rule, remains constant throughout the time of calls made.

Advantages of the Circuit Switched Network

• Controlled timing; bits move from A to B within a set time
• Low delay times
• Very little jitters, or variations in delay
• Ideal for transmission of real-time signals, like video and voice

Disadvantages of the Circuit Switched Network

• Each connection, or circuit, is separate
• Circuit remains reserved even if no data is exchanged
• While a circuit is reserved, it can not be used by others

The internet consists of a so-called packet switched, connectionless network. In other words, information packets can be exchanged without having to follow an established connection. Bandwidth is shared among users. One example of such a connectionless exchange is the NTP, or Network Time Protocol. A packet may be sent to the NTP from any computer without first having to establish a connection. The time server will then return the time.

Advantages of the Packet Switched Network

• It is not necessary to establish connections
• Resources are shared
• If no data needs to be transmitted, no space is consumed

Disadvantages of the Packet Switched Network

• Packets must have large headers to include addresses
• Shared resources may result in delays due to queues
• Unpredictable timing due to delays
• Voice or video transmission is difficult due to delays
• Packets may get lost during transmission
• 'Best Efforts' protocol means no guarantee packages will be delivered.

what is the similereties of network and internet?